From time to time, I will hand my phone to someone else to use to look up something, or use it for a presentation. During these times, it can sometimes be embarrassing or disrupting when personal text notifications pop up on-screen, but this feature is too hard to turn on and off.
Please add a "Do not disturb" option to the little settings menu on the top-right. Obviously, the best implementation would be up to you; but I'm mainly looking for the quick option to suppress the on-screen text notifications and the vibrator. The badge, notification icon, and off-screen notifications in the notification pull-down menu are fine though.